Firefox

Deleting the DigiNotar CA certificate

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Mozilla has learned that a fraudulent SSL certificate for websites belonging to Google has been issued by DigiNotar. This is not a Firefox-specific issue and the certificate has now been canceled which should protect most people.

Mozilla has released an update to Firefox to further protect you. Please update as soon as possible by following the steps in the Updating Firefox article.

You can manually delete this certificate from any version of Firefox with these steps:

At the top of the Firefox window, click on the Firefox button and then select Options.At the top of the Firefox window, click on the Tools menu and then select Options.On the menu bar, click on the Firefox menu and select Preferences....At the top of the Firefox window, click on the Edit menu and select Preferences.

Click the menu button
and choose Options.Preferences.

Click on the Advanced panel

Select the Encryption tab

Click View Certificates

In the Certificate Manager window, select the Authorities tab

Scroll down to DigiNotar and select the DigiNotar Root CA

Click Delete or Distrust...

Click OK to confirm

Because the certificate is "built-in" it will be distrusted but not deleted. Distrusting the certificate has the same effect as deleting it.